/*
 * Copyright 2020-2030 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      https://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.gitee.minimalismstyle.fresh.gateway.handler

import com.gitee.minimalismstyle.fresh.common.core.extra.log
import org.springframework.http.HttpStatus
import org.springframework.http.MediaType
import org.springframework.stereotype.Component
import org.springframework.web.reactive.function.BodyInserters
import org.springframework.web.reactive.function.server.HandlerFunction
import org.springframework.web.reactive.function.server.ServerRequest
import org.springframework.web.reactive.function.server.ServerResponse
import reactor.core.publisher.Mono

import org.springframework.cloud.gateway.support.ServerWebExchangeUtils.GATEWAY_ORIGINAL_REQUEST_URL_ATTR

/**
 * hystrix服务降级处理
 * @author maoxiaodong
 */
@Component
class HystrixFallbackHandler : HandlerFunction<ServerResponse> {

    override fun handle(serverRequest: ServerRequest): Mono<ServerResponse> {
        val originalUris = serverRequest.attribute(GATEWAY_ORIGINAL_REQUEST_URL_ATTR)

        originalUris.ifPresent { originalUri -> log.error("网关执行请求:{}失败,hystrix服务降级处理", originalUri) }

        return ServerResponse.status(HttpStatus.INTERNAL_SERVER_ERROR.value())
                .contentType(MediaType.TEXT_PLAIN).body(BodyInserters.fromValue("服务异常"))
    }
}
